Analysis about the Jointing Status for Dissimilar Metals of Steel with Magnesium

2012 ◽  
Vol 233 ◽  
pp. 374-379 ◽  
Author(s):  
Zong Xiang Yao ◽  
De Ping Jiang ◽  
Chao Pan ◽  
Xiao Ming Wang
Keyword(s):  
Adverse Effect ◽  
Intermetallic Compound ◽  
Laser Welding ◽  
Welded Joint ◽  
Welding Process ◽  
Dissimilar Metals ◽  
Hybrid Welding ◽  
Pressure Welding ◽  
Diffusion Brazing ◽  
Welding Pressure

The research status of welding process between magnesium with steel have been surveyed．This article detailed the laser welding, Laser-TIG hybrid welding, pressure welding,diffusion brazing. The paper pointed out that it is a prominent problem of magnesium to be oxidated easily and existing intermetallic compound in the joint, which will produce adverse effect to property of welded joint. So how to control morphology and existence state of intermetallic compound (IMC) is the key for quality connectors in joining of magnesium with steel.

Fiber Laser Welding of Noncombustible Magnesium Alloy

2008 ◽  
Vol 580-582 ◽  
pp. 479-482 ◽  
Author(s):  
Yuji Sakai ◽  
Kazuhiro Nakata ◽  
Takuya Tsumura ◽  
Mitsuji Ueda ◽  
Tomoyuki Ueyama ◽  
...  
Keyword(s):  
Tensile Strength ◽  
Magnesium Alloy ◽  
Laser Welding ◽  
Fiber Laser ◽  
Vickers Hardness ◽  
Laser Power ◽  
Welded Joint ◽  
Welding Process ◽  
Fiber Laser Welding ◽  
Laser Welding Process

Noncombustible magnesium alloy AMC602 (Mg-6mass%Al-2mass%Ca) extruded sheet of 2.0mm thickness was successfully welded using a fiber laser welding process at welding speed of 10m/min at 3kW laser power. Tensile strength of the welded joint was about 82 to 88% of that of the base metal. Vickers hardness, tensile strength and micro structural properties are also discussed.

Features of the Heating Process in Ultrasonic Welding of Polycarbonate Products under Independent Pressure

2020 ◽  
pp. 54-62
Author(s):  
S.S. Volkov ◽  
A.L. Remizov ◽  
A.S. Pankratov
Keyword(s):  
Welded Joints ◽  
Welded Joint ◽  
Welding Process ◽  
Ultrasonic Welding ◽  
Heating Process ◽  
Mechanism Of Formation ◽  
High Quality ◽  
Acoustic Contact ◽  
Welding Pressure

This paper presents a mechanism of formation of a hard-to-weld polycarbonate joint by ultrasonic welding. The method utilizes internal and external friction occurring in the welded joint area on abutting surfaces due to shear vibrations of the end of the upper part relative to the lower part. A layer of the heated welded material is formed, localized by thickness, in which predominant absorption of the ultrasonic vibrations occurs, which allows one to obtain high-quality and durable welded joints without significant deformation due to the concentration of thermal energy in the welding zone. The effect of independent welding pressure on the strength of the welded joint of polycarbonate is considered. A new method of ultrasonic welding under the conditions of independent pressure is proposed. The method consists of dividing the static welding pressure into two components: the pressure of the acoustic contact in the zone of contact of the waveguide with the product, and the welding pressure that compresses the welded products, with the latter component being lower than the former. In order to obtain high-quality welded joints made of polycarbonate and to prevent displacement of the welded edges during the welding process relative to each other, a special preparation of the welded edges is developed, which allows one part to be moved vertically relative to the other during the welding process. It is established that the quality of welding depends on the speed of movement and the angle of cutting the edges.

scholarly journals Fuzzy C-Means Partition Cluster Analysis and Validation Studies on a Subset of CiteScore Dataset

2019 ◽  
Vol 8 (9S3) ◽  
pp. 105-107
Keyword(s):  
Cluster Analysis ◽  
Laser Welding ◽  
Validation Studies ◽  
Welded Joint ◽  
Experimental Studies ◽  
Pulsed Laser ◽  
Welding Process ◽  
Pulsed Laser Welding ◽  
Fuzzy C Means

The article deals with promising areas of application of pulsed laser welding for products made of silver-based alloys. The results of experimental studies to improve the quality of the welded joint and the efficiency of the welding process with the use of activated absorption additives are presented

scholarly journals Fatigue properties of the fillet welded joint for non-load carrying type using hot-wire laser welding process

2015 ◽  
Vol 81 (828) ◽  
pp. 15-00119-15-00119
Author(s):  
Hiroyuki AKEBONO ◽  
Ryoichi MORIKAWA ◽  
Tadashi KADO ◽  
Masahiko KATO ◽  
Atsushi SUGETA
Keyword(s):  
Laser Welding ◽  
Welded Joint ◽  
Welding Process ◽  
Fatigue Properties ◽  
Hot Wire ◽  
Load Carrying ◽  
Laser Welding Process

scholarly journals Welding and Riveting Hybrid Bonding of 6061 Al and Carbon Fiber Reinforced Composites

Polymers ◽  
2021 ◽  
Vol 14 (1) ◽  
pp. 99
Author(s):  
Hongyang Wang ◽  
Bin Huang ◽  
Jinzhu Li ◽  
Nan Li ◽  
Liming Liu
Keyword(s):  
Mechanical Properties ◽  
Carbon Fiber ◽  
Welded Joint ◽  
Welding Process ◽  
Resin Matrix ◽  
Hybrid Welding ◽  
Fiber Reinforced ◽  
Cfrp Plate ◽  
Carbon Fiber Reinforced ◽  
The Impact

Welding and riveting hybrid bonding technology was applied to join 6061 aluminum alloy and carbon fiber reinforced plastics (CFRP). The laser-arc hybrid welding process and stepped rivets were used in the experiments to reduce the impact of the poor heat resistance of composites. The effect of hybrid welding arc current on the formation and mechanical properties of 6061 Al/CFRP joints was studied. Tensile shear load up to 4.65 kN was achieved by adjusting process parameters. The welding process and mode of the fracture were analyzed. The hybrid bonded joint obtained consisted of two parts: a welded joint of Al plate and Al rivet, and a bonded interface between Al plate and CFRP plate. The mechanical properties of the hybrid joint were mainly determined by the Al plate/Al rivet welded joint. The results of the study show that there are three interfacial bonding mechanisms between aluminum and CFRP. In addition to mechanical bonding between the Al plate and CFRP plate, there were also metallurgical bonding of Al-Mg intermetallic compounds with resin matrix and chemical reactions of aluminum with resin and carbon fibers at the interface, which could improve the mechanical properties of the joints.

scholarly journals USE OF FACTOR ANALYSIS METHODS IN THE STUDY OF THE STRUCTURAL STATE OF THE WELDED JOINT AFTER LASER WELDING

2021 ◽  
pp. 91-100
Author(s):  
D.V. LAUKHIN ◽  
O.V. BEKETOV ◽  
I.A. TIUTEREV ◽  
Yu.S. SLUPSKA ◽  
N.O. ROTT
Keyword(s):  
Factor Analysis ◽  
Laser Welding ◽  
Physical Meaning ◽  
Structural State ◽  
Welded Joint ◽  
Welding Process ◽  
Mathematical Apparatus ◽  
Mathematical Methods ◽  
Stage Of Development ◽  
The Relationship

Formulation of the problem. The use of the mathematical apparatus of factor analysis allows us to investigate the stability of correlations between individual variables. It is the correlations between the variables themselves, as well as between the variables and the selected factors that contain the basic information about the stage of development. The results of factor analysis will be informative if they can be interpreted from the point of view of the physical meaning of both the process under study and the factors that were obtained as a result of the application of factor analysis. Therefore, when identifying factors that will be used for further analysis, one should be guided not only by mathematical methods, but also by the physical meaning of identifying factors. Thus, the use of factor analysis in the study of material science problems (for example, the welding process) is reduced to the search and analysis of the most significant characteristics of the process (factors) among the data array that can be obtained during the process under study. Purpose. Investigation of the relationship between the structural state in the zones of the welded joint after laser welding of specimens from steel 10KhSND using the mathematical apparatus of factor analysis. Conclusion. In this work, the study of the relationship of the distribution of the structural state over the zones of the welded joint was carried out using the mathematical apparatus of factor analysis.

Welding of AZ31B Magnesium Alloy by YAG Laser/ TIG Arc Hybrid Welding Process

2004 ◽  
Vol 449-452 ◽  
pp. 417-420 ◽  
Author(s):  
Taewon Kim ◽  
Jong Cheol Kim ◽  
Yu Hasegawa ◽  
Yasuo Suga
Keyword(s):  
Magnesium Alloy ◽  
Laser Beam ◽  
Welded Joint ◽  
Welding Process ◽  
Beam Diameter ◽  
Hybrid Welding ◽  
Yag Laser ◽  
Az31b Magnesium Alloy ◽  
Welding Arc ◽  
Joint Application

Recently, magnesium alloy is in the limelight as ECological material with high ability of recycling and lightweight property. Especially, because of outstanding properties as a structural material, the magnesium alloy is in great demand. Under these circumstances, the technical researches and developments of welding process for magnesium alloy welding have great significance to expand industrial application of magnesium. In magnesium alloy welding, arc welding process is generally used. However, heat input by the welding arc affects the magnesium alloy plates, and as the result it makes wide heat affected zone and large distortion of the welded joint. As one of the possible means to improve quality of the welded joint, application of laser welding process may be recommended. However, the low boiling point of magnesium generates some weld defects, such as porosity and solidification cracking. Furthermore, the small laser beam diameter is very sensitive to edge preparation in butt joint. Accordingly, application of laser/ arc hybrid welding process to magnesium alloy welding was proposed. The laser/ arc hybrid welding process is a new process combining the laser beam and the arc as welding heat source. The laser beam and arc influence and assist one another. By application of hybrid welding, synergistic effects are achievable, and disadvantage of the respective processes can be compensated. In this study, welding of AZ31B magnesium alloy thin plates using YAG laser/ TIG arc hybrid welding process was investigated. In order to confirm the properties of the welded joints, tensile testing was performed.

Evaluation of Crack Sensitivity and Gap Bridging Ability during Laser Butt Welding of Aluminum 5J32 and 6K21 Alloys

2011 ◽  
Vol 695 ◽  
pp. 247-250 ◽  
Author(s):  
Young Nam Ahn ◽  
Cheol Hee Kim
Keyword(s):  
Laser Welding ◽  
Filler Metal ◽  
Welding Process ◽  
The Body ◽  
Filler Wire ◽  
Hybrid Welding ◽  
Body Structure ◽  
Butt Welding ◽  
Gap Bridging ◽  
6Xxx Series

Growing demand to reduce fuel consumption has accelerated the application of Al sheets to the body structure of automobiles. While recent studies on laser welding of Al 5xxx series and Al 6xxx series alloys have examined weldability, the laser autogenous welding usually results in low gap bridging capability and weld defects such as porosity, underfill, cracking, and so on. In this study, we evaluated the gap bridging capability and the crack sensitivity during laser autogenous welding, laser welding with filler wire, and laser-arc hybrid welding, respectively. Al 5J32 and 6K21 sheets were used as the base metal and Al 4xxx series and Al 5xxx series wires were used as the filler metal. Employing adequate welding conditions, the gap bridging capability during butt welding was investigated for each welding process. To clarify the solidification crack sensitivity, bead-on-plate welding was implemented for a tapered specimen as a self-restraint crack test. Compared with the laser autogenous welding, laser welding with filler wire and the laser-arc hybrid welding showed improved gap bridging capability and reduced crack sensitivity.

Characterization of Pressure Welding Process of Thin Sheet Metals in Cold and Warm Temperature Conditions

2007 ◽  
Author(s):  
Sasawat Mahabunphachai ◽  
Muammer Koc¸ ◽  
Jun Ni
Keyword(s):  
Stainless Steel ◽  
Bond Strength ◽  
Thin Sheet ◽  
Welding Process ◽  
Process Conditions ◽  
Sheet Metals ◽  
Pressure Welding ◽  
Temperature Levels ◽  
Copper Aluminum ◽  
Welding Pressure

The effects of material and process conditions in the pressure welding process of thin sheet metals on the minimum welding pressure and the final bond strength are investigated in this work. The studied parameters include the material type (copper, aluminum, nickel, and stainless steel), initial blank thickness (0.051–0.254 mm), welding pressure, welding temperature (25–300°C), surface condition (wet, dry, and brushed), and indenter size. Two sets of pressure welding apparatus were developed for testing of different materials and process conditions. Based on the experimental results, copper, aluminum, and nickel blanks were successfully bonded at room temperature (“cold welding”), while stainless steel blanks could only be joined at elevated temperature levels (150 and 300°C). The material type (i.e. strength) and thickness were shown to have significant impact on the welding pressure; in that more pressure is required to bond the blanks with higher strength or thinner. To reduce the required welding pressure, the process can either be carried out at elevated temperature levels or by scratch brushing the surfaces to be joined. In this study, the bond strength of the welded blanks was measured using tensile testing. The tensile test results showed that the bond strength could be increased by either scratch brushing the surfaces or by increasing the welding pressure or temperature. However, the increase in bond strength by increasing welding pressure was shown to have an optimal point, after which the bond strength would decrease with further increase in pressure. This critical pressure value appeared to be dependent on the material and process conditions. The width of the straight line indenter showed no significant impact on the minimum welding pressure. Finally, the bond formation mechanisms for different materials were studied through microscopic analyses. The microscopy images of the weld spots showed that for the bonding to take place, the contaminant layers at the surfaces must be removed or broken to allow the virgin metal underneath to be extruded through. The metallic bonds only form at these locations where both surfaces are free of contaminant layers.

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